track_example_01.c: internal refactoring of track example code.
track_example_01.c: internal refactoring of track example code.

- removed unnecessary box.
- fixed a typo of gcc build command.

tasn/elementary,rvandegrift/elementary,tasn/elementary,FlorentRevest/Elementary,FlorentRevest/Elementary,tasn/elementary,rvandegrift/elementary,rvandegrift/elementary,rvandegrift/elementary,FlorentRevest/Elementary,tasn/elementary,FlorentRevest/Elementary,tasn/elementary